Problemset - Codeforces

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Codeforces Round 1097 (Div. 1, Based on Zhili Cup 2026)
32:57:15
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Before contest
Codeforces Round 1097 (Div. 2, Based on Zhili Cup 2026)
32:57:15
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Problems

#	Name
2193G	Paths in a Tree dfs and similar, interactive, sortings, trees	2100	x2237
2193F	Pizza Delivery dp, greedy	1600	x8450
2192F	Fish Fight dp, dp, math, probabilities, probabilities	2900	x172
2192E	Swap to Rearrange constructive algorithms, dfs and similar, graph matchings, graphs, graphs, graphs, greedy, strings	2100	x2075
2192D	Cost of Tree dp, greedy, trees, trees	1800	x3547
2190G	Maximize Determinant graphs	3300	x96
2190F	Xor Product bitmasks, dp	3300	x92
2190E	Median Permutation combinatorics	3200	x235
2190D	Prufer Vertex combinatorics, dsu, number theory, probabilities, trees	2500	x950
2190C	Comparable Permutations greedy, implementation, interactive, sortings, two pointers	2300	x1290
2190B2	Sub-RBS (Hard Version) dp, games, implementation, strings	1900	x3179
2190B1	Sub-RBS (Easy Version) combinatorics, constructive algorithms, dp, greedy, strings, two pointers	1400	x10667
2189F	Zhora the Vacuum Cleaner data structures, dfs and similar, dp, greedy, implementation, sortings, trees	2800	x227
2189E	Majority Wins? constructive algorithms, greedy, math, strings	2600	x818
2189D2	Little String (Hard Version) combinatorics, dp, greedy, math, number theory	2200	x1944
2189D1	Little String (Easy Version) combinatorics, dp, greedy, math, number theory	1900	x3957
2189C2	XOR-convenience (Hard Version) bitmasks, constructive algorithms, math	1800	x6205
2187G	Many Cartesian Trees greedy, sortings, trees	3500	x98
2187F2	Al Fine (Counting Version) dp, trees	3500	x71
2187F1	Al Fine (Maximizing Version) binary search, data structures, divide and conquer, trees	3100	x212
2187E	Doors and Keys brute force, data structures, dp	3500	x325
2187D	Cool Problem bitmasks, dp, math	2600	x635
2187C	Jerry and Tom data structures, dfs and similar, dsu, games, graphs, greedy, trees	2300	x1371
2187B	Shortest Statement Ever bitmasks, constructive algorithms, dp, greedy	1800	x5283
2185H	BattleCows 2 binary search, brute force, data structures, dp, greedy	2500	x679
2185G	Mixing MEXes data structures, implementation, math	1800	x3304
2185F	BattleCows data structures, divide and conquer, implementation	1700	x5004
2185E	The Robotic Rush binary search, greedy, implementation, two pointers	1500	x10212
2184G	Nastiness of Segments binary search, data structures	1900	x2961
2184F	Cherry Tree dfs and similar, dp, graphs, trees	1900	x3893
2184E	Exquisite Array combinatorics, data structures, dsu, sortings	1800	x5768
2184D	Unfair Game combinatorics, dp, math	1600	x9495
2183I2	Pairs Flipping (Hard Version) constructive algorithms	3500	x69
2183I1	Pairs Flipping (Easy Version) constructive algorithms	3500	x82
2183H	Minimise Cost binary search, dp, greedy, sortings	3500	x159
2183G	Snake Instructions constructive algorithms, greedy, interactive	3200	x221
2183F	Jumping Man brute force, combinatorics, dfs and similar, dp, trees	2500	x1128
2183E	LCM is Legendary Counting Master dp, math, number theory	2100	x2851
2183D2	Tree Coloring (Hard Version) combinatorics, constructive algorithms, data structures, dfs and similar, greedy, implementation, trees	2100	x2497
2183D1	Tree Coloring (Easy Version) constructive algorithms, dfs and similar, greedy, trees	1500	x8848
2183C	War Strategy binary search, greedy, math, two pointers	1500	x10664
2182G	Short Garland combinatorics, data structures, dfs and similar, dp, trees	2800	x350
2182F2	Christmas Reindeer (hard version) bitmasks, brute force, combinatorics, data structures, greedy, math	2500	x1093
2182F1	Christmas Reindeer (easy version) bitmasks, brute force, combinatorics, dp, math	2300	x1269
2182E	New Year's Gifts binary search, data structures, greedy, sortings, two pointers	1800	x5566
2182D	Christmas Tree Decoration combinatorics, dp, greedy, math	1600	x8945
2181M	Medical Parity dp, strings	1700	x3478
2181L	LLM Training math, string suffix structures	2800	x133
2181K	Knit the Grid 2-sat, constructive algorithms, graphs, matrices	3500	x68
2181J	Jinx or Jackpot brute force, dp, math, probabilities	2300	x708
2181I	Irrigation Interlock geometry	3500	x50
2181G	Greta's Game binary search, dp, graphs, greedy, math	2400	x649
2181F	Fragmented Nim games	1600	x3517
2181E	Elevator Against Humanity brute force, constructive algorithms, greedy, sortings	2900	x144
2181D	Doorway binary search, data structures, sortings	2000	x1357
2181C	Cacti Classification binary search, constructive algorithms, interactive, math	3200	x148
2181B	Battle of Arrays data structures, games, greedy	1400	x5664
2180H2	Bug Is Feature (Conditional Version) games	3500	x105
2180H1	Bug Is Feature (Unconditional Version) games	3400	x120
2180G	Balance bitmasks, combinatorics, implementation, math	3500	x134
2180F2	Control Car (Hard Version) combinatorics, dp, matrices, probabilities	3200	x223
2180F1	Control Car (Easy Version) combinatorics, dp, probabilities	2800	x405
2180E	No Effect XOR bitmasks, divide and conquer, dp, greedy, math	2300	x1737
2180D	Insolvable Disks data structures, dp, greedy, math	1900	x4253
2180C	XOR-factorization bitmasks, constructive algorithms, dp, greedy, number theory	1900	x6459
2179H	Blackslex and Plants bitmasks, data structures, dp, implementation, math	2200	x1302
2179G	Blackslex and Penguin Migration brute force, interactive, math	2200	x1208
2179F	Blackslex and Another RGB Walking communication, constructive algorithms, graphs, interactive, number theory, trees	2000	x2747
2179E	Blackslex and Girls constructive algorithms, geometry, math	1800	x5776
2178I	Numbers or Fireworks bitmasks, combinatorics, dp, graphs	3300	x219
2178H	Create or Duplicate bitmasks, graphs, number theory, shortest paths	3300	x311
2178G	deCH OR Dations bitmasks, data structures, dp, hashing, probabilities	2800	x593
2178F	Conquer or of Forest combinatorics, math, trees	2200	x1824
2178E	Flatten or Concatenate binary search, divide and conquer, interactive	2000	x3686
2178D	Xmas or Hysteria constructive algorithms, greedy, implementation, math	1700	x6695
2176F	Omega Numbers bitmasks, combinatorics, dp, math, number theory	2400	x1487
2176E	Remove at the lowest cost data structures, dfs and similar, dp, dsu, greedy, implementation, trees	2400	x1276
2176D	Fibonacci Paths data structures, dp, graphs, sortings	1800	x5759
2174F	Mosaic Tree combinatorics, dp, fft, math, trees	2800	x466
2174E2	Game of Scientists (Version 2) binary search, chinese remainder theorem, dfs and similar, interactive, math	3200	x97
2174E1	Game of Scientists (Version 1) chinese remainder theorem, constructive algorithms, interactive, math	3100	x134
2174D	Secret Message data structures, dp, greedy, trees	3400	x292
2174C2	Beautiful Patterns (Hard Version) combinatorics, math, probabilities	2500	x1023
2174C1	Beautiful Patterns (Easy Version) combinatorics, math, probabilities	2400	x1165
2174B	Wishing Cards dp	1900	x3963
2173F	Isla's Memory Thresholds binary search, brute force, data structures, divide and conquer, math	2600	x562
2173E	Shiro's Mirror Duel constructive algorithms, greedy, interactive, probabilities, sortings	2200	x1533
2173D	Taiga's Carry Chains bitmasks, brute force, dp, greedy, math	1900	x3632
2173C	Kanade's Perfect Multiples brute force, constructive algorithms, greedy, number theory	1400	x12371
2172N	New Kingdom constructive algorithms, graphs, implementation	2800	x163
2172L	Maximum Color Segment dp, implementation	2300	x801
2172K	Kindergarten Homework implementation, strings	2100	x842
2172J	Sliding Tiles data structures, divide and conquer, dsu	2300	x561
2172I	Birthday geometry	2000	x1078
2172H	Shuffling Cards with Problem Solver 68! hashing, string suffix structures, strings	2500	x302
2172G	Gene Editor	3300	x66
2172F	Cluster Computing System graphs, greedy, math	1600	x3888
2172D	Divisor Card Game combinatorics, dp	3100	x103
2172C	Circles Are Far from Each Other binary search, greedy	3100	x95
2172B	Buses greedy, sortings	1800	x2134

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